Re: [whatwg/dom] Introduce `moveBefore()` state-preserving atomic move API (PR #1307)

Would it be possible to have this method fallback to `insertBefore` if the conditions for an atomic move are not met? 

Without this, in practice it seems likely that users will need to write a boilerplate function that tests the 2 nodes for `isConnected` before calling. 

```js
const moveOrInsertNode = (container, node, ref_node = null) => {
 const canMove =  (container.isConnected && node.isConnected && (!ref_node || ref_node.parentNode === container);
  return canMove ? container.moveBefore(node, ref_node) : container.insertBefore(node, ref_node);
}
```

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